Eaton Posi limited-slip | GM 8.5″ Front/Rear Chevy 1971-1989 | 28 Spline Axles | 2.73 & Up

The Eaton Posi limited-slip differential is the perfect way to control traction in street rods, light duty pickups and all types of tarmac running race cars.

Specs

Part Number: 19557-010

Traction Type: Eaton Posi limited-slip

Carrier Break: 2.73 & Up

Differential: GM 8.5″

Vehicle Fitment

• 1977 – 1986        Chevrolet             C10
• 1970 – 1981        Chevrolet             Camaro
• 1973 – 1977        Chevrolet             El Camino
• 1971 – 1985        Chevrolet             Impala
• 1977 – 1986        Chevrolet             K10
• 1977 – 1986        Chevrolet             K20
• 1977 – 1986        Chevrolet             K20 Suburban
• 1973 – 1977        Chevrolet             Malibu
• 1973 – 1977        Chevrolet             Monte Carlo
• 1971 – 1979        Chevrolet             Nova
• 1970 – 1972        Chevrolet             Brookwood
• 1979 – 1986        GMC      C1500
• 1979 – 1987        GMC      G1500
• 1979 – 1987        GMC      G2500
• 1977 – 1978        GMC      K15
• 1979 – 1986        GMC      K1500 Suburban
• 1977 – 1978        GMC      K25
• 1979 – 1986        GMC      K2500
• 1979 – 1986        GMC      K2500 Suburban
• 1970 – 1987        Oldsmobile         Cutlass
• 1971 – 1981        Pontiac Firebird
• 1973 – 1980        Pontiac Grand Am
• 1975 – 1977        Pontiac Grand LeMans
• 1971 – 1977        Pontiac Grand Prix
• 1977 – 1979        Pontiac Phoenix
• 1972 – 1977        Pontiac LeMans
• 1976 – 1986        Pontiac Parisienne
• 1971 – 1977        Pontiac Ventura
• 1971 – 1975        Pontiac Grandville
• 1972 – 1973        Pontiac GTO

Download EATON Application Guide PDF

Operation

The Posi prevents wheel slip before it can get started. Racebred carbon disc clutch packs, preloaded by a central spring assembly, are located behind each differential side gear. When torque input changes (one wheel slips), the clamping load on the clutch packs increases, causing them to smoothly transfer power to the other wheel as needed.

Performance

The Eaton Posi is smooth and automatic, requiring no driver input. Featuring pyrolytic carbon clutches and a rebuildable design, the Posi can be custom tuned for your desired performance.

Lubrication

A quality, petroleum-mineral based, GL5 rated 80w-90 gear oil should be used. It is necessary to add a four-ounce bottle of friction modifier for optimum performance (if friction modifier has not already been added to the petroleum-mineral based gear oil).

Features

• Superior rebuildable design
• Race-bred carbon friction discs
• Limited-slip operation
• Smooth and automatic engagement – no driver action needed
• Tunable via various spring packs (a.k.a. pre-loads)